RE: [802.21] Network Controlled Handover and IS
I don't have any doubt that 802.21 needs to support network initiated
handovers. Many networks such as 3GPP and even WiMax are more operator
controlled type networks and we need to accept that and support that in
the 802.21 standard. Of course terminal initiated handovers shall always
be supported. So what are the additional requirements?
1] Measurements type dynamic info:
As mentioned earlier different access technologies already provide these
in some form (especially those that already support intra-mobility,
since the same measurements are required in those cases as well).
2] Application requirements and User/Terminal policy information:
Not sure if all of this needs to be handled by 802.21 and even then if
and can this be standardized. One way to do this would be to have some
commands/events for exchange of vendor specific/app specific type
messages and leave it at that. We may need clear requirements for
something more specific.
3] Generic Handover commands/message exchanges:
This would be a set of exchanges between client and network for
initiating handovers and managing the handover process (failure cases as
well). These could be generic across different access networks and could
go over L3 (most likely) or L2 (let's not preclude for now) as well.
These have already been defined in some preliminary form in current
draft.
4] Resource query and query of network capabilities:
If a network entity decides to initiate handover, it may need to query
access networks about available resources/QoS levels etc. as part of
handover decision making. Some of this functionality is also included in
current 802.21 draft and we can evolve this to comprehend other
different cases.
(Please also note that resource query as an option was considered for a
long time during proposal stage in 802.11-Tgr but was eventually
rejected for intra-mobility cases, so it's not clear if we may need to
do, that much more here beyond existing capabilities in different access
networks that already support intra-mobility.)
Anything else?
Please keep the good thoughts rolling so that we can get this very
important aspect of 802.21 discussed and key requirements identified.
Best Regards
-Vivek
-----Original Message-----
From: stds-802-21@ieee.org [mailto:stds-802-21@ieee.org] On Behalf Of
Junghoon Jee
Sent: Thursday, August 25, 2005 2:10 AM
To: stefano.faccin@NOKIA.COM; STDS-802-21@listserv.ieee.org
Subject: RE: [802.21] Network Controlled Handover and IS
Stefano,
> [Junghoon]
> I tend to agree about the scenario that Stefano mentioned as
> a general application of MIH.
> However, I have some concern regarding the network-initiated
> inter-technology handover.
> To support not one or two mobile terminals, overloading of
> MIH _handover_ control entity by enormous MIH events and commands...
> IMO, it would be better to let a mobile terminal have a brain
> about inter-technology handover decision.
>
>
> [[Stefano] ] I surely don't disagree that there are
> challenges. however, there are at present requirements coming
> from some 3GPP operators to enable such network controlled
> handoffs, and I believe 802.21 should enable them. If one
> wants to use them or not, that's up to the manufactures and
> operators. If we do not enable the scenarios for which we
> have requirements, we risk to restrict 802.21 applicability
> to the real world.
Thank you for good information.
I did actually guess there's coming a requirement from the network
operator
side.
Hopefully, it needs to be resolved.
Possibly, we can list-up some requirement in providing
network-controlled
MIH handover.
Regards,
Junghoon